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HEC-WAT has been developed for the U.S. Army Corps of Engineers (USACE). However, software developed at the Hydrologic Engineering Center (HEC) is made available to the public whenever appropriate. Use is not restricted and individuals outside of USACE may use the software without charge. HEC will not provide user assistance or support for this software to non-USACE users. Downloading this software indicates full acceptance of the user's responsibility in the use of this software. Please see the distribution policy for more details.

Note: HEC-WAT Version 1.0 is a provisional release that will undergo certification through the Flood Risk Management Planning Center of Expertise. HEC-WAT should not be used for final decisions regarding USACE planning study until certification is complete.

Current Version HEC-WAT 1.0:    

The install packages include HEC-WAT Version 1.0; HEC-HMS (4.2.1), HEC-ResSim (3.3), HEC-FIA (Version 3.0.1), and HEC-SSP (2.2.1).

Primary Download Site:
Download HEC-WAT 1.0 Setup Package (724 Mb)
Download HEC-WAT 1.0 (portable package) for Windows (788 MB)

Alternate Download Site:
Download HEC-WAT 1.0 Setup Package (724 Mb)
Download HEC-WAT 1.0 (portable package) for Windows (788 MB)

Supported Operating Systems:
Windows 7, 8, 8.1, and 10 64-bit



HEC-WAT 1.0 Documentation:    

HEC-WAT User's Manual
HEC-WAT Quick Start Guide
HEC-WAT Hydrologic Sampler User's Manual
HEC-WAT Release Notes

Adding the HEC-WAT Hydrologic Sampler User's manual to the HEC-WAT software:
  Step 1 - Download the HEC-WAT Hydrologic Sampler User's Manual (CPD-88b.pdf; 10.5MB)
  Step 2 - From the HEC-WAT folder, from the 1.0 folder, from the HEC-WAT folder, in the documentation
                folder - copy CPD-88b.pdf
  Step 3 - Run HEC-WAT, from the Help menu, the Hydrologic Sampler User's Manual item will now be active,
                and when clicked the HEC-WAT Hydrologic Sampler User's Manual will display.



HEC-WAT 1.0 Example Data & Studies:    

Download Example Data for HEC-WAT Quick Start Guide (1.57 GB)
Download Example HEC-WAT study (333 MB)
Download Example HEC-WAT study that includes a Time Window Modifier script (15.3 MB)